When you Sign Out of Frame.io and then sign back in, after typing your email address you will see the option to click I forgot my password.
If you do not see this and you automatically sign in, you can use the link:
This will send the email address entered an email with a link to generate a new password.
If you are using a Google powered email address, Frame.io sends you to Google to sign in using that extra layer of security. If you wish to have the Google Authentication disabled, contact support and they can do this for you.